149
10 Configuration
nominal
cell constant
for CR: 0.01 to 10 cm
-1
for Ci: 4.00 to 8.00 cm
-1
nominal cell constant of the conductivity sensor
(can be read from the sensor nameplate)
If an ASTM test certificate showing precisely-
measured cell constants is available, in addition
to entering the nominal cell constants the relative
cell constants of all measuring ranges in the cal-
ibration values must be manually entered (cf.
Chapter "Manual entry of calibration values",
page 206). The relative cell constants must be
calculated from nominal cell constants (name-
plate for the sensor) and measured cell con-
stants (ASTM test certificate):
(measured cell constant × 100 %) ÷ nominal cell
constant = relative cell constant.
Calculation example:
nominal cell constant = 0.1 cm
-1
measured cell constant = 0.1014 cm
-1
rel. cell constant =
(0.1014 cm
-1
× 100 %) ÷ 0.1 cm
-1
= 101.4 %
Cell type 2 electrodes
4 electrodes
For conductivity sensors with 4 electrodes, pollu-
tion detection is made available.
Pollution
detection
OFF
ON
possible only for conductive conductivity
measurement in a 4-wire circuit:
When this function is activated, a sensor alarm is
triggered in case of soiling.
Wire break
detection
OFF
ON
possible only for conductive conductivity
measurement:
When this function is activated, a sensor alarm is
triggered in case of a sensor wire break.
Alarm/Event list off
event
alarm
possible only for conductive conductivity
measurement:
Assignment of the sensor failure notification to
alarm list or event list
Sensor alarm
delay
0to999s possible only for conductive conductivity
measurement:
The sensor alarm is suppressed for the set dura-
tion of the alarm delay.
Text sensor alarm up to 21 text characters possible only for conductive conductivity
measurement:
Text for the alarm/event list in case of sensor er-
ror
Measuring range se-
lection 1
Selection from
binary selector
Measuring range selection permits selection of
the measuring ranges 1 to 4 by controlling the bi-
nary signals.
⇨ Chapter "CR/Ci measuring range switching",
page 150
Measuring range se-
lection 2
Selection from
binary selector
Configuration point Selection/
setting option
Explanation
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